Use case

From Wikipedia: https://en.wikipedia.org/wiki/Gua_sha)

Gua sha (Chinese: 刮痧), or kerokan (in Indonesia), is a traditional Chinese medicine (TCM) practice in which a tool is used to scrape people's skin in order to produce light petechiae. Practitioners believe that gua sha releases unhealthy bodily matter from blood stasis within sore, tired, stiff, or injured muscle areas to stimulate new oxygenated blood flow to the areas, thus promoting metabolic cell repair, regeneration, healing, and recovery.

Use this part at your own risk. Beware of negative side effects or even serious injuries that can result from this practice!

Printing

Simply print this part in the uploaded orientation. I used 5 top and bottom layers and 4 perimeters with 25% infill to make the part strong. I have used PETG but PLA should probably work as well. 

Post processing

Make sure the rounded edges are really nice and smooth before you use this part. If needed, do a little sanding on the edges.

Please like it if you like it

Your satisfaction is my reward. Please like this design or post a make if you like it.

Happy printing!